Hand abrader



May 13, 1947- A. W. JENSEN 2,420,397

HAND ABRADER Filed May 10, 1946 Z6 Z5 Z4 Z 26 f mm2 Ff Patented May 13, i947 11 Claims. l

This invention relates to a hand abrader for abrading or sandpapering various surfaces including the surfaces of articles of furniture and the like.

An object of the invention is to provide a simple mid relatively inexpensive hand abrader or socalled sandpapering device for use in sandpapering which is so constructed and arranged that all of the parts of the available abrasive surface on a continuous web of sandpaper or like abrasive paper may be utilized successively by adjustment of the parts embodied in the new hand abrader or sandpapering device.

Another object of the invention is to provide in the new hand abrader or sandpapering device a novel construction and arrangement for tensioning the continuous web of sandpaper or like abrasive material upon and relative to the supporting frame which is embodied in the new hand abrader.

A further object of the invention is to provide a novel construction and arrangement for eiecting manual adjustment of the sandpaper or abrasive web upon and relative to the supporting frame of the new hand abrader or so-called sandpapering device.

Other and further objects of the present invention will be apparent from the following description and claims and are illustratedl in the accompanying drawing Which, by way of illustration, shows a preferred embodiment of the present invention and the principles thereof and what I now consider to be the best mode in which I have contemplated applying these principles. Other embodiments of the invention embodying the same or equivalent principles may be used and structural changes may be made as desiredk by tho-se skilled in the art Without departing from the present invention and the purview of the appended claims.

In the drawings:

Fig. 1 isV a side elevational view of a hand abrader embodying the present invention;

Fig 2 is a top plan view of the hand abrader shown in Fig. 1;

Fig. 3 is a central longitudinal vertical sectional View on line 3-3 in Fig. 2;

Fig. 4 is a transverse vertical sectional view on line 4 4 in Fig. 1;

Fig. 5 is a transverse vertical sectional view on line 5 5 in Fig. l; and

Fig. 6 is a fragmentary detail View on line in Fig. 5.

A preferred embodiment of the new hand abrader or so-called sandpapering device is illustrated in the drawing wherein it is generally indicated at Ii) and comprises a main supporting frame l! which is substantially rectangular in shape and includes a top wall I2, a bottom Wall i3 and end walls Iii and I5. As shown in Fig. 3, the top wall I2 of the main supporting frame member II has an end portion I6 which is bent downwardly at one end of the supporting frame ll, and this end portion I5 has a centrally arranged notch or recess Se formed therein (Figs. 4 and 5). The bottom wall I3 has an upwardly extending end portion 35 and this end portion 35 has a centrally arranged tongue portion 36 which projects into and is slidably intertted with a correspondingly shaped notch or recess 3 in the depending end wall portion I6 of the top wall I2. Thus, the parts l-ll-S and 36 cooperate to form the end wall Id of the supporting frame I I.

The end wall I5 of the supporting frame II is formed in a similar manner but in this instance the bottom wall I3 has an upward extension I9 which is provided with a centrally arranged notch or recess 3l which corresponds to theV recess 34. The top wall I2 of the supporting frame I I has a depending end portion I8 which is provided with a centrally arranged tongue 38 (Fig. 3) and this tongue 38 extends into and is slidably intertted with the notch or recess 3l in the end wall Dortion iS. Thus the parts IS-IS--B'I and 38 cooperate to form the end wall I5 but the arrangement of the parts IB-I-S-'l-SS in the end wall t5 is complementary or opposite to the arrangement of the parts Ifi-S-S-SS in the end wall i4 of the supporting frame I I.

The top wall I2 has a portion 2i! partially struck therefrom at each side thereof and each of these partially struck out portions 2G provides an opening 2l which extends parallel to the long axis of the supporting frame II at the side thereof and throughout the major portion of its extent (Fig. 2).

As shown in the drawing (Fig. 2)- each of the parts 2d which are partially struck from the top wallI I2 of the supporting frame II is integrally attached at each end, as at 39, to a corner portion M9 of the top wall I2. As shown in Fig. 2, the inner ends of these corner portions l0 define the end walls of the slots 2 I.

' It will thus be seen that the parts 29, as shown in Figs. 4 and 5, project partially above and partially below the top wall l2 of theV supporting frame II and project outwardly beyond the side edges of the supporting frame II, for a reason which will be explained hereinafter.

The botto-m wall i3 of the supporting frame I I has parts 22 formed therein and these parts 22 are similar to the parts 2) formed in the top wall I2 and provide or form slots 23 in the bottom wall i3 which correspond to the slots 2| in the top wall I2 of the supporting frame (Fig. 4)

The new hand abrader or sandpapering device includes a pair of adjustable clamping side plates or members 21, each of which includes a main side wall portion 28. A pair of inwardly extending anges 4| are formed on each of the side wall clamping plates 23, one at each end thereof, as shown in Figs. 4, 5 and 6, and these inwardly extending flanges 4| are frictionally engaged with the inner surfaces of the end walls I4 and |5 of the main supporting frame As shown in Figs. 4 and 5, each of the adjustable clamping side plates 2'|28 has an outwardly and upwardly flared or extending clamping flange 30 formed at the top thereof and a corresponding outwardly and downwardly flared or extending clamping flange 3D formed at the bottom thereof. Each of the upper clamping flanges Sil is adapted to bear against and to have clamping engagement with the outer surface of one of the flanges 2D formed in the top wall I2 of the supporting frame II and each of the lower clamping flanges 3| is adapted to have clamping engagement with the outer surface of one of the lower clamping flanges 22 formed on the bottom wall I3 of the supporting frame i I.

Each of the adjustable side clamping plates 23 has a longitudinally extending indentation or recess 29 formed therein, substantially midway between the top and bottom thereof (Figs. 1 and 3) and each of these longitudinally extending indentations or recesses 29 terminates in or merges into a substantially circular-shaped recess or indentation 22. The longitudinally extending indentations or recesses serve as reinforcing ribs to strengthen the adjustable side clamping plates 27-28.

A hole 43 is formed in each of the substantially circular-shaped recesses or indentations 42 and a threaded bolt 32 is extended through each of the holes 43, and to this end the holes 43 and the substantially circular-shaped recesses or indentations 42 in the adjustable clamping side plates 21-28. As shown in Figs. l and 4, a wing nut 33 is threaded into the threaded outer end portion of each of the bolts 32 and, as shown in Fig. 4, the wing nuts 33 are disposed largely within the substantially circularshaped recesses or indentations 42 and inwardly of the outer ends of the clamping flanges 3o and 3| on the adjustable clamping side plates 21-28 so as to facilitate grasping the new hand abrader or sandpapering device in the hand of the user.

A washer 44 is arranged on the outer end portion of each of the bolts 32 between the wing nut 33 and the outer surface of the wall of the corresponding substantially circular-shaped recess or indentation 42.

A pad or cushion 24 of resilient material such, for example, as sponge rubber, is arranged upon the top wall |2 of the supporting frame I I, between the flanges 2li, and a similar pad or cushion 25 of resilient material such, for example, as sponge rubber, is arranged upon the bottom wall I3 between the flanges 22. The resilient pads 24 and 25 may be adhesively or otherwise attached to the top and bottom walls I2 and I of the supporting frame Il.

A continuous exible web or band 25 of abrasive material such, for example, as sandpaper or the like, is extended entirely around the main supporting frame of the new hand abrader Eil and over the top and bottom resilient pads or cushions 24 and 25 and down over the end walls i4 and l 5 on the outer sides thereof.

In the use of the new hand abrader the parts of the supporting frame II and the adjustable side clamping plates 2li- 28 and the resilient pads or cushions 24 and 25 may be assembled and arranged in their respective positions in which they are shown in the drawing. A continuous flexible web 26 of sandpaper or like abrasive material may then be arranged upon the device in the manner shown so that it extends over the top of the resilient pad or cushion 24 and over the bottom of the lower resilient pad or cushion 25 and down along the end walls I4 and I5 of the supporting frame I I on the outer sides thereof. When thus positioned, the exible abrasive web 25 may be tightened in position of use by adjusting the wing nuts 33 on the bolts 32. This action forces the clamping flanges 30 and 3|, which are carried by the adjustable clamping side plates 2'l-28, against the anges 2D and 22 which are carried by the top and bottom Walls |2 and I3, respectively, of the main supporting frame II. The pressure of the clamping flanges 31| and 3! against the anges 2D and 22 urges the top and bottom walls I2 and I3 of the main supporting frame I apart, relative to each other, and during this operation the tongue 36 on the end wall portion 35 slides in the notch 34 and the tongue 28 on the end wall portion I8 slides in the notch 3l. This movement of the top and bottom walls I2 and I 3 of the supporting frame forces the resilient pads or cushions 24 and 25 outwardly against the inner surface of the flexible abrasive web 25 and thus distends the latter and holds it in the desired adjusted position.

The hand abrader is then ready for use and is used by the operator by clasping it in his or her hand and moving the outer abrasive coated top or bottom surface of the abrasive web 26 over the surface which is to be abraded or sand papered.

After the abrasive coating has. been worn away from the top and bottom outer surfaces of the flexible web 26 a new and previously unused area. thereof may be moved into position to be used by loosening the wing nuts on the bolts 32 and adjusting the clamping side plates 21-28 so as to move the clamping flanges and 3| out of engagement with the flanges 25J and 22, respectively. The flexible abrasive web 25 may then be moved around and relative to the supporting frame so as to move another and previously unused portion or area of the flexible abrasive web 26 into position of use. The flexible abrasive web 25 may then again be secured in position of use by tightening the wing nuts 33 on the bolts 32 so as to move the clamping anges 3B and 3| into clamping engagement with the anges 2E! and 22, respectively, and thus move the upper wall I2 and the lower wall I3 of the main supporting frame i against the resilient pads 24 and 25, respectively. As pointed out hereinbefore, this urges the resilient pads 24 and 25 against the inner and uncoated surface of the abrasive web 26 and thus secures the same in the desired adjusted position ready for use. This operation may be repeated until substantially all of the abrasive coated area of the flexible abrasive web 2G has been utilized, thus eifecting an economy in the use of the flexible abrasive coated paper web 26.

vsnorted? It ywill be understood, .in :this connection, that Vin order eifectively to use afhand abrader :of the .character contemplated by the present invention, it is possible to use at any .one time :only .the outerabrasive coated surfacew ich .extends over the top of the :upper resilient or cushion 24 on the abrasive coated surface which extends below the bottom surface of the lbottom resilient pad orcushion since it is het possible effectively to use these areas or portions ofthe flexible abrasive web 25 which extend `down over the end walls it and l5 onthe outer sides thereof.

It will thus be seen from the foregoing description, considered in coniunction Vwith the Yacobjects, including those hereinbefore pointed out and others which are inherent in the invention.

I claim: '1. A Yhand abrador comprising a supporting frame including a top wall and bottom wail movable relative to toward and away from f each other, a pad of resilient aterial arranged upon the upper and outer surface of the said top wall and a pad of resilient material arranged upon the lower and outer surface of the said bottom wall of the said supporting frame, a continuous exible web of abrasive coated material extending around the said supporting trarne and over the outer surfaces of the said resilient pads, and means including manually adjustable devices carried by the said supporting frame for urging the said top wall and the bottom wall of the said supporting frame 'away from each other so as to urge the resilient pads carried thereby into engagement with the inner surfaces of the said flexible abrasivecoated web.

2. A portable abrading tool comprising a supporting frame including a ci substantially parallel walls, a pad of resilient material carried by each of the said substantialiy parallel walls of the said supporting `frame, a continuous iexible web of abrasive-coated material extending around Y the said supporting frame and over the said resilient pads on the outer surfaces of the latter, and means carried by the said supporting frame and coacting with the said substantially parallel walls thereof for spreading the latter apart so as to urge the said resilient pads carried thereby into engagement with the inner surfaces of the said flexible abrasive-coated. web.

3. A hand abrader as deiined in claim 1 in which each of the said top and bottom walls of the said supporting frame has a flange formed thereon on each side edge thereof and in which the said means for urging the said top and bottom walls away from each other includes a pair of clamping plates adjustably mounted on the said supporting frame at the sides and between the said top and bottom walls thereof, and in which each of the said clamping plates has a flange formed on each edge thereof and in which each of the said flanges on the said clamping plates is engageable with one of the said flanges on the said top and bottom walls of the said supporting frame for urging the said top and bottom walls apart relative to each other.

4. A hand abrader as deiined in claim 1 in which each of the said top and bottom Walls of the said supporting frame has a ange formed thereon on each side edge thereof and in which the said means for urging the said top and bottom walls away from each other includes aa .pair .ofgclampingplates adjustably mounted on the said supporting frame `at the `sides .thereof and in which each of the said clamping plates extends substantially vertically between the said top and bottom walls of the said supporting frame, and in which each oi the said clamping plates has a flange formed on each edge thereof and in which `each of the said flanges on the said clamping plates is engageable with one of the said flanges on the said top and bottom walls of the said supporting frame for urging the said top and bottom walls apart relative to each other, and in which each of the said i'ianges on the said top and bottom walls and each of the said flanges on the said clamping plates extends at an acute angle relative to the vertical extent of the said clamping plates between the said top and bottom walls of the said supporting frame.

5. A hand abrader as defined in claim 1 in which the said supporting frame includes substantially parallel end walls formed by cooperating extensions of the said top and bottom slidably intertted with each other.

5. A hand abrader as defined in claim 1 in which each of the said top and bottom walls of the `said supporting frame has a flange formed thereon on each' side edge thereof and in which the said means for urging the said top and bottom walls away from each other includes a pair of clamping plates adjustably mounted on the said supporting frame at the sides thereof and in which each of the said clamping plates extends substantially vertically between the said top and bottom walls of the said supporting frame, and in which each of the said clamping plates has a flange formed on each edge thereof and in which each of the said anges on the said clamping plates is engageable with one of the said iianges on the said top and bottom walls of the said supporting frame for urging the said top and bottom walls apart relative to each other, and in which each of the said flanges on the said top and bottom walls and each of the said flanges on the said clamping plates extends at acute angle relative to the vertical extent of rthe said .clamping plates between the said top and bottom walls of the said supporing frame, and in which the said means for urging the said top and bottoni walls apart includes a pair of substantially parallel threaded members extending transversely through the said supporting frame and through the said clamping plates, and in which each' of the said threaded members has a manually operable threaded member adjustably threaded onto each end portion thereof and in which the said manually operable threaded members are engageable with said clamping plates so as to urge the latter toward each other upon and relative to the said Erst-named threaded members.

7. A hand abrader as dened in claim l in which the said supporting frame is elongated and substantially rectangular in shape and includes a pair of substantially parallel end walls which are substantially shorter in length than the said top and bottom walls and are formed by cooperating and slidably intertted extensions of the said top and bottom walls.

8. A hand abrader as defined in claim 1 in which each of the said top and bottom walls of the said supporting frame has a ange formed thereon on each side edge thereof and in which th'e said means for urging the said top and bottom walls away from each other includes a pair of clamping plates adiustably mounted on the 7 said supporting frame at the sides and between the said top and bottom walls thereof, and in which each of the said clamping plates has a flange formed on each edge thereof and in which each of the said anges on the said clamping plates is engageable with one of the said flanges on th'e said top and bottom walls of the said supporting frame for urging the said top and bottom walls apart relative to each other, and in which the said supporting frame is elongated and substantially rectangular in shape and includes a pair of substantially parallel end walls which are substantially shorter in length than the said top and bottom walls and are formed by cooperating slidably interiitted extensions of the said top and bottom walls, and in which each of the said clamping plates has a substantially vertically and inwardly extending flange formed thereon at each end thereof, and in which each of the said substantially vertically and inwardly extending flanges formed in each of the said clamping plates is frictionally and slidably engaged with the inner surface of one of the said end walls of the said supporting frame.

9. A portable hand abrading tool comprising a supporting frame including a main body and top and bottom supporting walls movable relative to the said main body of the said supporting frame, a resilient member carried by each' of the said relatively movable top and bottom supportingr walls, a flexible web of abrasive-coated material carried by the said supporting frame and extending over both of the said resilient members on the outer sides thereof, and means including a a pair of spaced manually adjustable clamping plates carried by the said supporting frame and movable relative thereto for urging the said relatively movable top and bottom supporting walls and the said resilient member carried thereby away from the said main body of the said supporting frame so as to urge the said resilient members against the said flexible abrasiva coated web on the inner surface thereof.

l). A hand abrader as defined in claim l in which each of the said top and bottom walls of the said supporting frame has a flange formed thereon on each side edge thereof and in which the said means fo1` urging the said top and bottom walls away from each other includes a pair of clamping plates adjustably mounted on the said supporting frame at the sides thereof and in which each of the said clamping plates extends substantially vertically between the said top and bottom walls of the said supporting frame, and in which each of the said clamping plates has a flange formed on each edge thereof and in which each of the said flanges on the said clamping plates is engageable with one of the said flanges on the said top and bottom walls of the said supporting frame for urging the said top and bottom walls apart relative to each other, and in which each of the said flanges on the said top and bottom walls and each of the said flanges on the said clamping plates extends at an acute angle relative to the vertical extent of the said clamping plates between the said top and bottom walls of the said supporting frame, and in which the said means for urging the said top and bottom walls apart includes a pair of substantially parallel threaded members extending transverse- Y ly through the said supporting frame and through the said clamping plates, and in which each of the said threaded members has a manually operable threaded member adjustably threaded onto each end portion thereof and in which the said manually operable threaded members are engageable with said clamping plates so as to urge the latter toward each other upon and relative to the said rst-named threaded members, and in which each of the said clamping plates has a pair of recesses formed therein and in which each of the said manually adjustable threaded members is disposed in one of the said recesses.

11. A portable hand abrading tool as defined in claim 9 in which each of the said top and bottom Walls of the said supporting frame has a flange formed thereon on each side edge thereof and in which the said means for urging the said top and bottom walls away from each other includes a pair of clamping plates adjustably mounted on the said supporting frame at the sides and between the said top and bottom walls thereof, and in which each of the said clamping plates has a flange formed on each edge thereof and in which each of the said flanges on the said clamping plates is engageable with one of the said anges on the said top and bottom walls of the said supporting frame for urging the said top and bottom walls apart relative to each other,

ANKER W. JENSEN.

REFERENCES CITED UNTTED STATES PATENTS Name Date Pritchard et al Dec. 8, 1936 Number 

